Means for mounting rock-drills.



O. S. TONNESEN. MEANS FOR MOUNTING ROCK DRILLS.

APPLICATION FILED JUNE 19. 1913- Patented Nov. 16, 1915-.

COLUMBIA PLANDORAPH c0.. WASHINGTON, n. c.

UNITED @TA OTTO STUHAUG TONNESEN, F JOHANNESBURG, TRANSVAAL, SOUTH AFRICA.

MEANS FOR MOUNTING ROCK-DRILLS.

Specification of Letters Patent.

Patented Nov. 16, 1915.

Application filed June 19, 1913. Serial No, 774,549.

To all whom it may concern:

Be it known that I, Or'ro STUI'IAUG Tonnnsnn, a subject of the King of Norway, and resident of Johannesburg, Province of Transvaal, Union of South Africa, have invented a certain new and useful Improvement in Means for Mounting Rock-Drills, of which the following is a specification.

This invention relates to mountings for rock drills and more particularly to mountings for the type of drills known as hammer drills.

The object of this invention is to provide a supporting means for such drills particularly adapted for drilling holes in the ends of rock cuts where there is a small amount of head room, such holes generally being substantially in line with the floor of the cut, this supporting means being so constructed as to relieve the operator from the weight of the drill and to be easily manipulated and placed in position.

IVith this object in view, I have devised a mounting practical embodiments of which are shown in the accompanying drawings in which Figure 1 shows a side elevation of a, drill equipped with the mounting, Fig. 2 shows a side elevation partly in section, of the mounting without the drill, Fig. 8, a transverse section taken on the line XX of Fig. 2 and Figs-4t and 5, details of a modified form of guiding mechanism for the drill Carriage.

In the drawings the mounting is shown in connection with a drill which is of ordinary construction, provided with a steel 2 proj ecting into a hole 8 in the rock face. The mounting comprises a leg or supportfi to the upper end of which is secured a guide 5 which is mounted at its center on the leg i and extends transversely thereof at right angles or substantially so. In the guide 5 is mounted a drill carrying slide 6. This slide can be secured in the guide 5 in any suitable manner permitting it to slide freely therein. The particular anti friction means shown will be described later. The leg or support 4 is shown as comprising an outer tubular member 7 and an inner tubular member 8 which telescopes inside the memher 7 so-that the leg 4: can be adjusted to any desired length. The inner member 8 is provided with holes 9 at various points along its length while the outer member is provided with a diametrical hole 10. To adjust the leg 4 to any desired length a pin 11 is provided with a projection 12 for holding it in place. This pin can be inserted through the holes 9 either below the outer tubular member 7 or through the hole so that the members 7 and 8 can be held in any desired relative position. A chain 13 attached to the pin 11 and to a ring It on the tubular member 7 prevents the pin 11 from being lost. In order to prevent relative rotation of the elements 7 and 8 and hence noncoincidence of the holes 9 and 10, the tubular member 7 may be provided with a lug 16 sliding in a longitudinal slot in the tubular member 8. A pointed plug 17 is secured in the lower end of the tubular member 8 which provides a foot portion for the leg and allows it to be held in any desired position without slipping. The guide 5 is secured in the upper end of the tubular member 7 by means of a cylindrical plug 18 which fits in its upper end. In the ends of the guide 5 are mounted two pairs of rollers comprising upper rollers 19 and lower rollers 20, these rollers being spool shaped with a depressed portion 22 in their centers. Between these rollers slides the lower bar 23 of the sliding element 6, the slide 6 also having an upper bar 24 above the guide 5 there being a slot or opening 21 between the bar 23 and the bar 2-1, for the reception of the rollers 19. The lower bar 23 is provided with longitudinal ribs or projections 25 and 26 which fit in the depressed portions 22 of the rollers 19 and 20. Projecting upwardly from the slide 6 are two pairs of drill carrying arms 27 and 28 the forward pair having open ended slots 29 which serve to hold pins 30 which project laterally from the sides of the drill while the rearward arms 28 have holes 31 through which is passed a bolt 32 which passes also through a hole in the handle 33 of the drill.

. In Figs. 4: and 5 a modified construction of the slide and guiding rollers is shown in which there are provided single rollers in each end of the guide on which rests the upper bar 24 of the slide 6, the bar 24 in this case being provided with a longitudinal rib which fits in the depressions in the rollers while the lower bar 23 is also provided with such a rib, these bars being spaced so that both of them are not in contact with the rollers at the same time. The rollers may be in two desired.

In operation, when a hole is to be started the supporting leg is placed in such a position under the drill and guide that the center of gravity of the whole mechanism is practically over the point of support. In this way the operator is relieved of practically all the wei ht of the mechanism and can with slight ehort swing it forward or away from the rock face to get the proper direction of the hole, there being absolute freedom of motion in the most important direction, that is in the plane determined by the axes of the guide and the supporting leg, sidewise swinging movement on the point of support being desirable but not essential. The fact that the leg forms the only contact with the supporting rock and merely rests thereon of course enables the mechanism to be easily moved bodily to a desired position. In practical operation, the present mounting although available for use in cuts of any angle is particularly adapted for use in downwardly slanting cuts such as shown in Fig. 1. When used in such a cut, the drill must be pulled back in its guide so that it approaches the rearward limit of its movement in the guide, before the mechanism will be balanced over the supporting point. This of course allows the maximum length of feed for the drill without changing the position of the support. In this parts as shown in Fig. 5, if

I position also the weight of the drill is of great assistance in feeding the drill forward. It will be evident also that to relieve the operator of the weight of the drill, the mechanism need only be balanced over the point of support when the hole is started, since when the hole is once started and the center of gravity of the system begins to move forward from above the point of support, the downward stress will be taken up to a large extent by the steel which projects into the hole.

It is to be understood that the present showing and description discloses only certainspecified modifications of my. invention and other forms and modifications are included in the spirit and scope of the inventionas expressed in the claims.

What I claim is:

1. In a mounting for hammer drills, a drill guide, a supporting leg for said guide substantially at right angles thereto, said supporting leg having a portion adapted to rest on the ground and allow free angular movement of said guide and leg in the plane determined by their axes, and a drilling engine freely slidable on said guide.

In a mounting for hammer drills, a drill guide, a supporting leg substantially at right angles to said guide, said leg having a foot portion adapted to rest on the ground and allow free angular movement of said leg and guide toward and from the rock wall in starting a hole, and a drilling machine freely slidable in said guide above said leg.

3. In a. mounting for hammer drills, a single supporting leg having a foot portion adapted to rest on the ground and to be moved freely thereon, a drill guide transversely secured to the upper end of said leg and a drilling machine freely slidable in said guide.

l. In a mounting for hammer drills, a single supporting leg having a foot portion adapted to rest 011 the ground and to be moved freely, means to adjust the length of said leg, a drill guide transversely secured to said leg, an element freely slidable in said guide and a drill secured on said sliding element.

5. In a mounting for hammer drills, a drill guide, a drill freely slidable in said guide, and a single leg secured at the center of said guide and substantially at right angles thereto, for supporting said drill and guide.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

OTTO STUHAUG TONNESEN.

lVitnesses:

CHAS. OVENDALE, A. THOMPSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

